Specifications

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●
Type 2 surge protectors
Type 2 surge protectors are designed to be installed at the
beginning of the installation, in the main switchboard, or
close to sensitive terminals, on installations without LPS
(lightning rods). These protectors are tested following the
Class II test from IEC61643-11 or EN61643-11standards and
based on 8/20
㎲
impulse current injection.
●
Type 3 surge protectors
In case of very sensitive or remote equipment, secondary
stage of surge protectors is required : these low energy
SPDs could be Type 2 or Type 3.
Type 3 SPDs are tested with a combination waveform
(1,2/50
㎲
- 8/20
㎲
) following Class III test.
Disconnection devices
In compliance with the standards, the AC power surge
protectors are equipped with external and internal disconnection
devices in order to provide total safety in case of failure.
●
2 types of devices are necessary :
- Internal thermal security which will disconnect the surge
protector from the AC network in case of thermal runaway.
In such a case, the user will be warned about the trouble by
an indicator (mechanical or light) in front of the protector
and will carry out the substitution of the defective SPD.
-
External electrical disconnection (fuses or breaker) to disconnect
the surge protector from the AC network in case of internal short
circuit, i.e.due to an excessive impulse current. The rating of the
external fuses (or breaker) are in relation with the discharge
capability of the SPD and the prospective short-circuit current of
the installation. To ease the selection of these components, the
rating and type of fuses (or breaker) is mentioned in the SPD
instructions by the manufacturer.
Note : even if standards require safety devices, the risk of
disconnection of the surge protectors is very low.
Maintenance
DS surge protectors are designed for repetitive operation and
do not require specific maintenance. Nevertheless, in case of
an extreme event, a controlled end of life could occur (see
above) and a maintenance operation must be performed .
●
Signalling
DS surge protectors are equipped with a failure indicator
(mechanical or light) linked to the internal thermal
disconnector : in case of safety disconnection, the indicator
will switch on and the SPD must be replaced.
●
Remote Signalling
Most DS surge protectors are available in << remote
signalling
>> versions.
This feature, which allows remote checking of the stauts of
the surge protector, is especially important when the
products are hard to reach or unsupervised.
The system consists of an auxiliary changeover contact that
is activated if the surge protector module changes status.
This lets the user monitor :
- the good operation of the SPD
- the presence of the plug-in modules (if any)
- the end of life (disconnection) of the surge protector.
The remote signalling version allows the choice of signalling
system appropriate to the installation (light, buzzer,
automation, modem transmission...).
●
Pluggable design
The design of some DS surge protectors (DS10, DS40,
DS70R...) is based on the use of a pluggable module that
plugs into a matching receptacle.
This makes replacement, and checking very easy without
impairing the protection function. On multipolar surge
protectors, the possibility of replacing a single pole makes
rehabilitating a surge protector less expensive.
The plug-in module is identified with a color label in relation
with the type (Black = Type 1 ; Red = Type 2 ; Blue = Type 2
low power or Type 3) and are keying for operating voltage, in
order to avoid mistakes.
●
Redundancy
Some DS versions (DS70R, DS150E, DS250E) are equipped
with a redundancy feature : these SPDs are made with
several protection branches in parallel : in case of failure,
only one branch will be disconnected and the surge
protection function will still be partially in operation, in order
to wait safely for SPD replacement.